DC series oilfield drilling fluids decanter
centrifuge is used in drilling mud system for separating
suspension of solids phase with particle diameter(d≥2μm) for drilling mud
circulation and drilling fluids recycling. Ruggedly built for oilfield and
industrial services, drilling mud centrifuge is especially effective in
environmentally sensitive areas. It delivers high fluid-recovery rates and
efficient solids
control to significantly reduce the costs of makeup fluids and disposal. The
oil drilling mud decanting centrifuge must test the dynamic balance for smooth
operation over long periods.Speed ranging from 0 to 3900 RPM, generating
centrifugal forces reach up to 3000G.
As decanting centrifuge is highly efficient and effective, there has been
little change in the technology regarding centrifuge equipment over the past few
decades. The life span of a typical centrifuge ranges from 15 to 25 years
depending on the style of the equipment and the quality of the manufacturer.
Furthermore, the life of the machinery can be extended an additional 10 to 20
years with proper maintenance and care.
Consequently, good centrifuge equipment can offer an extremely high return on
your initial investment. This is why it is imperative that a prospective buyer
consider the total cost and quality of the centrifuge as well as the estimated
delivery time.
Decanter centrifuge is a important equipment in solids control system. It is
widely used in drilling waste management system and oilfield mud circulation
system. Decanting centrifuge separate the suspending fluids using the principle
of centrifugal action, the suspending fluids is pushed into the rotor drum
through the inlet pipe and the fluid hole of the spiral feeder.
Under the influence of centrifugal force, solid phase particles are pushed to
the internal wall of the drum, then to the mud export of the small end of the
drum and excreted. But the fluids is excreted from the overflow hole of the
large end. Such cycle is in order to achieve the purpose of continuous
separation.High speed decanting centrifuge is effective for separation.
2015年3月31日星期二
Some common problems of drilling desander cone
Separating solids of drilling fluids, hydrocyclones in different
specifications work against different diameters and for different
cleannesses.
Hydrocyclone is usually installed on the drilling mud desilter, desander and mud cleaner in oilfield drilling mud system. It is the most important component for them.
Oilfield drilling mud desander is used as the 2nd stage drilling fluid solids control equipment of drilling mud system.The oil drilling desander makes separations between 45 and 75 microns.
However, some problems may arise when adjusting the underflow outlet:
1. “Dry Underflow”: Relatively smaller outlet can pile a layer of dry silt between it and the balanced point. When ultra-fine solids enter, its water goes through the layer and dewatered solids block the outlet, causing dry plug. And this is called “dry underflow” adjustment.
2. “Wet Underflow”: Relatively larger underflow outlet can discharge conical rotating liquid. And this is called “wet underflow”.
3. “Radial” Discharge: Commonly, two flows move mutually reversely at the apex, one is the air inhaled and another the solid-content slurry discharging radially, forming an annular curtain there. Inhaled air keeps the outlet open and the cyclone efficient.
4. “Rope-like Discharge”: When the solid content excessively exceeds the designed capacity, the hydrocyclone is over-loaded and solids flow out outlet in a rope-like shape, making no air or annular curtain but a nozzle possible. Then, some solid phase within limits will turn around and out from vortex finder.
Hydrocyclone is usually installed on the drilling mud desilter, desander and mud cleaner in oilfield drilling mud system. It is the most important component for them.
Oilfield drilling mud desander is used as the 2nd stage drilling fluid solids control equipment of drilling mud system.The oil drilling desander makes separations between 45 and 75 microns.
However, some problems may arise when adjusting the underflow outlet:
1. “Dry Underflow”: Relatively smaller outlet can pile a layer of dry silt between it and the balanced point. When ultra-fine solids enter, its water goes through the layer and dewatered solids block the outlet, causing dry plug. And this is called “dry underflow” adjustment.
2. “Wet Underflow”: Relatively larger underflow outlet can discharge conical rotating liquid. And this is called “wet underflow”.
3. “Radial” Discharge: Commonly, two flows move mutually reversely at the apex, one is the air inhaled and another the solid-content slurry discharging radially, forming an annular curtain there. Inhaled air keeps the outlet open and the cyclone efficient.
4. “Rope-like Discharge”: When the solid content excessively exceeds the designed capacity, the hydrocyclone is over-loaded and solids flow out outlet in a rope-like shape, making no air or annular curtain but a nozzle possible. Then, some solid phase within limits will turn around and out from vortex finder.
Harms of excessive fluid loss to drilling operation
Rock cuttings, the major harmful solids in mud, can exert great influence on
the mud properties as they add to the density, viscosity, yield point, water
loss, abrasiveness, treacliness and flow resistance, and can trigger various
bore hole complications like damage of formations, reduction of drilling
velocity, increase of table torque, resistance of each trip, sticking drilling,
leakage, blowout, etc.
Pressure gradients naturally genders fluid loss through the walls from the drilling mud as drilling processes, subsequently developing into borehole collapse and drilling-related accidents. Thus, filtrate reducer plays a significant role in maintaining relatively low fluid loss, one of the essential properties of the mud.
Pressure gradients naturally genders fluids loss through the walls from the drilling mud as drilling processes. Excessive fluid loss can impact many aspects of drilling operations:
1. Shale formation can expand and collapse and the wall be less stabilized.
2. Fluid penetration can expand the clay, blocking the oil and gas channel and damaging the formation.
3. Larger fluid loss thickens the filter cake, narrows the borehole diameter, increases the torque of drilling rig, hinders “going in”, weakens cementing quality, etc.
KOSUN is a professional solid control equipment manufacturer in China, which establishment in 1992. KOSUN can supply shale shaker,vacuum degasser,mud cleaner, desilter,desander,decanter centrifuge,centrifugal pump, screw pump,mud tank,jet mud mixer, diesel tank, shear pump,mud agitator,mud gun,water tank,etc
KOSUN has directly exported its products to the following regions: All-Russia Region, including Russia, Kazakhstan, Uzbekistan, Azerbaijan, Ukraine, Turkmenistan, Kyrgyzstan,Tajikistan, etc.; East Asia and South Asia, including Pakistan, India, Indonesia, Thailand, Burma, Malaysia, etc.; the Middle East and North Africa, including the United Arab Emirates, Kuwait, Egypt, Algeria, Libya, Sudan, etc.; America, including the United States, Canada, Mexico, Brazil, Columbia, Venezuela, etc.; Australia; Germany in Europe.
Pressure gradients naturally genders fluid loss through the walls from the drilling mud as drilling processes, subsequently developing into borehole collapse and drilling-related accidents. Thus, filtrate reducer plays a significant role in maintaining relatively low fluid loss, one of the essential properties of the mud.
Pressure gradients naturally genders fluids loss through the walls from the drilling mud as drilling processes. Excessive fluid loss can impact many aspects of drilling operations:
1. Shale formation can expand and collapse and the wall be less stabilized.
2. Fluid penetration can expand the clay, blocking the oil and gas channel and damaging the formation.
3. Larger fluid loss thickens the filter cake, narrows the borehole diameter, increases the torque of drilling rig, hinders “going in”, weakens cementing quality, etc.
KOSUN is a professional solid control equipment manufacturer in China, which establishment in 1992. KOSUN can supply shale shaker,vacuum degasser,mud cleaner, desilter,desander,decanter centrifuge,centrifugal pump, screw pump,mud tank,jet mud mixer, diesel tank, shear pump,mud agitator,mud gun,water tank,etc
KOSUN has directly exported its products to the following regions: All-Russia Region, including Russia, Kazakhstan, Uzbekistan, Azerbaijan, Ukraine, Turkmenistan, Kyrgyzstan,Tajikistan, etc.; East Asia and South Asia, including Pakistan, India, Indonesia, Thailand, Burma, Malaysia, etc.; the Middle East and North Africa, including the United Arab Emirates, Kuwait, Egypt, Algeria, Libya, Sudan, etc.; America, including the United States, Canada, Mexico, Brazil, Columbia, Venezuela, etc.; Australia; Germany in Europe.
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